INORGANIC DIELECTRICS RESEARCH
Abstract
A ceramic of very fine crystal size (0.2 - 0.5 micron) was produced by devitrification from a finely powdered barium titanate glass. An evaluation of industrial hot pressed boron nitride revealed that it is both porous and soluble which causes deterioration of its electrical properties under high humidity conditions. Alumina bodies were fired in four atmospheres; hydrogen, oxygen, argon or vacuum, and evaluated for density, moisture absorption, total porosity and translucency. Microscopic methods were used to determine grain and pore size. Development of low loss ceramics with dielectric constants in the range of 12 to 15 was pursued. The lanthana-alumina-silica system was selected for study. Electrical properties of composition within the system are given. Correlations of these properties with regard to crystal and glass content, crystalline types and porosity are also presented. A brief review of the work on hot extrusion of ceramic materials is presented.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 31, 1963
- Accession Number
- AD0430912
Entities
People
- C. J. Phillips
- D. R. Ulrich
- E. J. Smoke
- E. L. Kastenbein
- R. C. Pitetti